If you need to ask in this forum, high chance is that you don't
qualify.
By right, can be any NSF/NSman/regular officer, but subject to SAF
selection. You cannot sign up directly with UN.
From history, they usually only consider MAJ, LTC and above, whom
they deem mature enough to conduct the task.
Observers do not go there and see see only....their duty is to
ensure that a conflict area is observing a ceasefire or a peace
agreement.
Means two sides already agree to some peace...observers go in
representing UN , to make sure both sides really follow.
Observers may be lightly armed, but not actively engaging in a
combat role, but for defensive purpose.
The observer need to be mature enough, and of high enough rank to
command respect and be able to make decisions, assessments of
whether either side is breaking the peace agreement.
Some of the our past SAF observers have really been heroes, such as
a Commando Colonel (MAJ then), whom when evacuated under enemy
fire, stayed on to evacuate other foreign UN personnel, although he
could just walk away....and many others.